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Eigrp link bundle

Posted on 2013-11-14
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Last Modified: 2013-11-14
I've recently installed a new serial link to a neighboring site to perform equal-cost load balancing with EIGRP.
However, my boss refuses to issue me another IP network for this link, and he forbids me to variably subnet the existing network. Can you make it work? The exiting IP for serial link is 192.168.12.0/24
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Question by:nchoful
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Expert Comment

by:Don Johnston
ID: 39647864
So let me see if I got this correct:

You installed a second serial link to another site (which I'm guessing costs money).  But your boss (who I'm also guessing approved this new link) refuses to provide you with an IP address so that you can use the link?  And he "forbids" you from variably subnetting the existing serial link IP address?

This smalls like a homework type scenario.

But what the heck:  You're using private IP addresses. I can only assume that you know what addresses are currently in use (if not, look at the routing table). Then select an unused address.  Maybe something like 192.168.255.0/30.
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Author Comment

by:nchoful
ID: 39648148
Yes, my boss actually thinks it can work and he has asked me to find a way out.
i have been doing some research on it from Cisco blogs and i have found out that you can create a port-channel and bind the old and the new serial links interface together so as to share the same IP on the logical port-channel interface .

I'm about to simulate the solution with a network simulation software(GNS3). I will keep u informed if it works out.

And thank you for your reply.
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Don Johnston earned 2000 total points
ID: 39648211
Not all platforms and IOS versions support etherchannel (which, by the way, is an ethernet protocol and can't run on a serial link). You did not indicate which router platform or IOS version you are running.

Did you try multi-link PPP?
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Author Comment

by:nchoful
ID: 39648357
thanks for your quick response .... My proposed solution didn't work with the serial interfaces since ether-channel does not support serial links. i'm trying multi-link ppp as a solution and so far it's looking good.

I'm running c7200-adventerprisek9-mz.124-11.T on Cisco 7201 Router.
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by:Don Johnston
ID: 39648385
PPP Multi-Link will work with that platform/IOS.
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